Unicel C-4311 Replacement Filter Cartridge for 45 Square Foot Spa Filter<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 4 15/16-inch; length: 12 1/4-inch</li><li>Top end cap: open， 2-1/8-inch inner diameter; bottom end cap: open， 2-1/8-inch inner diameter</li><li>Pleat count: 212; filter media: 3-ounce reemay 2033; filter area: 45 square feet</li><li>Get more efficient filtration and better water clarity with Unicel filters</li><li>Longer time between cleanings; meets oem specifications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41SV6GAmmIL.jpg" noproxy>